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CI workflow (testem/testem)

The CI workflow from testem/testem, explained and optimized by Latchkey.

C

CI health: C - fair

Point runs-on at Latchkey and get run de-duplication, job timeouts, SHA-pinned actions, self-healing for flaky steps, and up to 58% lower cost, applied automatically.

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Source: testem/testem.github/workflows/ci.ymlLicense MITView source

What it does

This is the CI workflow from the testem/testem repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)
name: CI

on:
  push:
    branches:
      - master
      - "0.6"
      - "0.8.x"
      - v*
  pull_request:

jobs:
  lint:
    name: lint
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-node@v6
        with:
          node-version: 22
          cache: "npm"
          cache-dependency-path: package.json
      - run: npm i
      - run: npm run lint

  test:
    strategy:
      matrix:
        os: [ubuntu-latest]
        node: [20, 22, 24]
        include:
          - os: macos-latest
            node: 22
          - os: windows-latest
            node: 22
      fail-fast: true

    runs-on: ${{ matrix.os }}

    steps:
      - uses: browser-actions/setup-firefox@v1.7.2
      - uses: actions/checkout@v7
      - uses: actions/setup-node@v6
        with:
          node-version: ${{ matrix.node }}
          cache: "npm"
          cache-dependency-path: package.json
      - run: firefox --version
      - run: npm i
      - uses: nick-invision/retry@v4.0.0
        with:
          timeout_minutes: 10
          max_attempts: 3
          retry_on: error
          command: npm test
      - run: sudo apt-get install -y libgtk2.0-0
        if: runner.os == 'Linux'
      - name: npm run integration
        uses: GabrielBB/xvfb-action@v1.7
        with:
          run: npm run integration

  safari-smoke:
    name: safari-ci-smoke
    runs-on: macos-latest
    timeout-minutes: 15

    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-node@v6
        with:
          node-version: 22
          cache: "npm"
          cache-dependency-path: package.json
      - run: npm i
      - run: npm run ci:safari-smoke

  browser-tests:
    name: browser-tests
    runs-on: ubuntu-latest
    timeout-minutes: 10
    concurrency: "sauce"

    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-node@v6
        with:
          node-version: 22
          cache: "npm"
          cache-dependency-path: package.json
      - run: npm i
      - run: npm run browser-tests
        env:
          SAUCE_USERNAME: testem-ci
          SAUCE_ACCESS_KEY: 1f00979e-0252-4d69-98ff-f6c85d1a746b

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: CI
 
on:
  push:
    branches:
      - master
      - "0.6"
      - "0.8.x"
      - v*
  pull_request:
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  lint:
    timeout-minutes: 30
    name: lint
    runs-on: latchkey-small
 
    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-node@v6
        with:
          node-version: 22
          cache: "npm"
          cache-dependency-path: package.json
      - run: npm i
      - run: npm run lint
 
  test:
    timeout-minutes: 30
    strategy:
      matrix:
        os: [ubuntu-latest]
        node: [20, 22, 24]
        include:
          - os: macos-latest
            node: 22
          - os: windows-latest
            node: 22
      fail-fast: true
 
    runs-on: ${{ matrix.os }}
 
    steps:
      - uses: browser-actions/setup-firefox@v1.7.2
      - uses: actions/checkout@v7
      - uses: actions/setup-node@v6
        with:
          node-version: ${{ matrix.node }}
          cache: "npm"
          cache-dependency-path: package.json
      - run: firefox --version
      - run: npm i
      - uses: nick-invision/retry@v4.0.0
        with:
          timeout_minutes: 10
          max_attempts: 3
          retry_on: error
          command: npm test
      - run: sudo apt-get install -y libgtk2.0-0
        if: runner.os == 'Linux'
      - name: npm run integration
        uses: GabrielBB/xvfb-action@v1.7
        with:
          run: npm run integration
 
  safari-smoke:
    name: safari-ci-smoke
    runs-on: macos-latest
    timeout-minutes: 15
 
    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-node@v6
        with:
          node-version: 22
          cache: "npm"
          cache-dependency-path: package.json
      - run: npm i
      - run: npm run ci:safari-smoke
 
  browser-tests:
    name: browser-tests
    runs-on: latchkey-small
    timeout-minutes: 10
    concurrency: "sauce"
 
    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-node@v6
        with:
          node-version: 22
          cache: "npm"
          cache-dependency-path: package.json
      - run: npm i
      - run: npm run browser-tests
        env:
          SAUCE_USERNAME: testem-ci
          SAUCE_ACCESS_KEY: 1f00979e-0252-4d69-98ff-f6c85d1a746b

What changed

3 third-party actions are referenced by a movable tag. Pin them to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

This workflow runs 4 jobs (6 with the matrix expanded) per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout actions/setup-node